@thi.ng/compose
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Optimized functional composition helpers
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# 
[](https://www.npmjs.com/package/@thi.ng/compose)
[](https://mastodon.thi.ng/@toxi)
> [!NOTE]
> This is one of 210 standalone projects, maintained as part
> of the [@thi.ng/umbrella](https://github.com/thi-ng/umbrella/) monorepo
> and anti-framework.
>
> 🚀 Please help me to work full-time on these projects by [sponsoring me on
> GitHub](https://github.com/sponsors/postspectacular). Thank you! ❤️
- [About](#about)
- [Composition helpers](#composition-helpers)
- [Async functions](#async-functions)
- [Status](#status)
- [Installation](#installation)
- [Dependencies](#dependencies)
- [Usage examples](#usage-examples)
- [API](#api)
- [Authors](#authors)
- [License](#license)
## About
Optimized functional composition helpers.
## Composition helpers
- [comp()](https://docs.thi.ng/umbrella/compose/functions/comp.html)
- [compLeft()](https://docs.thi.ng/umbrella/compose/functions/compLeft.html)
- [complement()](https://docs.thi.ng/umbrella/compose/functions/complement.html)
- [constantly()](https://docs.thi.ng/umbrella/compose/functions/constantly.html)
- [juxt()](https://docs.thi.ng/umbrella/compose/functions/juxt.html)
- [partial()](https://docs.thi.ng/umbrella/compose/functions/partial.html)
- [threadFirst()](https://docs.thi.ng/umbrella/compose/functions/threadFirst.html)
- [threadLast()](https://docs.thi.ng/umbrella/compose/functions/threadLast.html)
- [trampoline()](https://docs.thi.ng/umbrella/compose/functions/trampoline.html)
### Async functions
- [compAsync()](https://docs.thi.ng/umbrella/compose/functions/compAsync.html)
- [delayed()](https://docs.thi.ng/umbrella/compose/functions/delayed.html)
- [juxtAsync()](https://docs.thi.ng/umbrella/compose/functions/juxtAsync.html)
- [promisify()](https://docs.thi.ng/umbrella/compose/functions/promisify.html)
- [threadFirstAsync()](https://docs.thi.ng/umbrella/compose/functions/threadFirstAsync.html)
- [threadLastAsync()](https://docs.thi.ng/umbrella/compose/functions/threadLastAsync.html)
- [trampolineAsync()](https://docs.thi.ng/umbrella/compose/functions/trampolineAsync.html)
## Status
**STABLE** - used in production
[Search or submit any issues for this package](https://github.com/thi-ng/umbrella/issues?q=%5Bcompose%5D+in%3Atitle)
## Installation
```bash
yarn add @thi.ng/compose
```
ESM import:
```ts
import * as comp from "@thi.ng/compose";
```
Browser ESM import:
```html
<script type="module" src="https://esm.run/@thi.ng/compose"></script>
```
[JSDelivr documentation](https://www.jsdelivr.com/)
For Node.js REPL:
```js
const comp = await import("@thi.ng/compose");
```
Package sizes (brotli'd, pre-treeshake): ESM: 815 bytes
## Dependencies
- [@thi.ng/api](https://github.com/thi-ng/umbrella/tree/develop/packages/api)
- [@thi.ng/errors](https://github.com/thi-ng/umbrella/tree/develop/packages/errors)
Note: @thi.ng/api is in _most_ cases a type-only import (not used at runtime)
## Usage examples
Two projects in this repo's
[/examples](https://github.com/thi-ng/umbrella/tree/develop/examples)
directory are using this package:
| Screenshot | Description | Live demo | Source |
|:--------------------------------------------------------------------------------------------------------------------------|:---------------------------------------------------------|:---------------------------------------------------------|:--------------------------------------------------------------------------------------|
| <img src="https://raw.githubusercontent.com/thi-ng/umbrella/develop/assets/examples/poly-subdiv.jpg" width="240"/> | Animated, iterative polygon subdivisions & visualization | [Demo](https://demo.thi.ng/umbrella/poly-subdiv/) | [Source](https://github.com/thi-ng/umbrella/tree/develop/examples/poly-subdiv) |
| <img src="https://raw.githubusercontent.com/thi-ng/umbrella/develop/assets/examples/rdom-canvas-basics.jpg" width="240"/> | Minimal rdom-canvas animation | [Demo](https://demo.thi.ng/umbrella/rdom-canvas-basics/) | [Source](https://github.com/thi-ng/umbrella/tree/develop/examples/rdom-canvas-basics) |
## API
[Generated API docs](https://docs.thi.ng/umbrella/compose/)
## Authors
- [Karsten Schmidt](https://thi.ng)
If this project contributes to an academic publication, please cite it as:
```bibtex
@misc{thing-compose,
title = "@thi.ng/compose",
author = "Karsten Schmidt",
note = "https://thi.ng/compose",
year = 2016
}
```
## License
© 2016 - 2025 Karsten Schmidt // Apache License 2.0